Individuals Maximize Utility in Allocating Their Time Only When

Individuals maximize utility in allocating their time only when

A) any change in their use of time reduces their total satisfaction
B) they consciously and carefully weigh the expected marginal utilities per unit
C) they consciously and carefully weigh the actual marginal utilities per unit of time spent in each activity
D) the expected average utility of each activity is equal
E) people make a concerted effort to measure satisfaction